STUDY OF ATOM MOLECULE COLLISIONS WITH ELECTROSTATIC ION STRAGE RING

静电离子存储环具有多种优点：1)它不仅可以存储重离子，即多原子分子离子，还可以存储簇离子、DNA离子和氨基酸离子，这些都是以前没有作为光束处理过的；2)在存储过程中，它可以通过发射辐射来冷却分子离子的振动激发态；3)与传统的一次通过实验相比，由于光束的循环，它的实际光束强度高，适合与电子束、中性束和激光束合并实验。通过发展静电离子存储环，并与其他光束合并实验，旨在探索生物分子离子激发态寿命或与电子、中性、正离子/负离子、激光等相互作用等原子碰撞的一个全新领域。2002年，我们构建了约8 m的环境环，环内保持在10^<-11> Torr阶的良好真空中。此外，我们成功地将环本身冷却到液氮温度，这是我们的环最重要的特征之一。2003年，我们开发了一种双浆型离子源，提供正负离子，并制备了一种用于选择离子种类的质谱分析仪和一种脉冲离子注入系统。此外，我们还制作了一个中性产物探测器，放置在直线段的延伸处，以及一个非破坏性的光束监测器，用于拾取光束的感应电荷。我们最近成功地使重稀有气体离子循环超过1000圈。在调整最佳操作参数后，我们计划使用可调谐激光器存储分子离子，并测量其寿命和振动光谱的温度依赖性。

Electrostatic ion storage rings have various advantages : 1)they can store very heavy ions, i.e., not only polyatomic molecular ions, but also cluster, DNA, and amino acid ions, which have not been previously dealt with as beams, 2)they can cool the vibrationally excited states of the molecular ions by emitting radiation during storage, and 3)their practical beam intensity is high due to circulation of beams compared with the traditional one-pass experiment, and they are suitable to merging experiments with electron, neutral and laser beams. By developing the electrostatic ion storage ring and merging experiments with other beams, we aimed to investigate a brand new field in atomic collision like lifetime of excited state of biomolecular ions or their interaction with electron, neutral, positive/negative ion, laser etc..In 2002, we constructed the ring with circumstance of about 8 m and the inside of the ring was kept in a good vacuum of 10^<-11> Torr order. Furthermore, we succeeded in cooling the ring itself down to the liquid nitrogen temperature, which is one of the most important characters of our ring. In 2003, we developed a Duoplasma-type ion source providing positive and negative ions, and prepared both a mass analyser to select ion species and a pulsed ion injection system. In addition we made a neutral product detector placed on the extension of the straight-line section, and a non-destructive beam monitor picking up the induced charge by the beam. We recently succeeded in the circulation of the heavy rare gas ions more than 1000 turns. Soon after tuning of the best operation parameters, we plan to storage molecular ions, and measure its temperature dependence of lifetime and vibrational spectroscopy using a tunable laser.